| 摘要 |
A new coffee extraction process has been discovered whereby a high concentration coffee extract, about 30-41 percent solids by weight of extract, can be produced in an ordinary percolation set with little, if any, loss of extraction yield. The key steps in this process include the use of intercolumn heaters to raise the temperature of the extraction liquor as it passes from column to column and reversing the flow of the extraction liquor through the extraction columns, at least in the spent end of the percolator set.
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